STIGQter: STIG Summary: Anduril NixOS Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 01 Oct 2025:

NixOS must prohibit the use of cached authenticators after one day.

DISA Rule

SV-268178r1131164_rule

Vulnerability Number

V-268178

Group Title

SRG-OS-000383-GPOS-00166

Rule Version

ANIX-00-002050

Severity

CAT II

CCI(s)

• CCI-002007 - Prohibit the use of cached authenticators after an organization-defined time period.

Weight

10

Fix Recommendation

Configure NixOS to prohibit the use of cached credentials older than one day.

Add the following Nix code to the NixOS Configuration, usually located in /etc/nixos/configuration.nix or /etc/nixos/flake.nix:

Note: The entire sssd.conf must be entered in this option.

services.sssd.config = ''
...
[pam]
offline_credentials_expiration = 1
...
'';

Rebuild and switch to the new NixOS configuration:
$ sudo nixos-rebuild switch

Check Contents

Verify NixOS, for PKI-based authentication, only caches authenticators for one day with the following command:

$ sudo grep expiration /etc/sssd/sssd.conf

offline_credentials_expiration = 1

If the offline_credentials_expiration is not set to "1" or is commented out, this is a finding.

Vulnerability Number

V-268178

Documentable

False

Rule Version

ANIX-00-002050

Severity Override Guidance

Verify NixOS, for PKI-based authentication, only caches authenticators for one day with the following command:

$ sudo grep expiration /etc/sssd/sssd.conf

offline_credentials_expiration = 1

If the offline_credentials_expiration is not set to "1" or is commented out, this is a finding.

Check Content Reference

M

Target Key

5658